come，动词；back，副词作状语；home，副词作状语
下面是home的解释：
ADV 向家;在家Home means to or at the place where you live.
His wife wasn't feeling too well and she wanted to go home...
他的妻子感到有些不舒服，想要回家。
I'll telephone you as soon as I get home...
我一到家就给你打电话。
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